BAEL-2659 - Reading a file in Groovy - added more examples and unit tests

core-groovy/src/main/groovy/com/baeldung/file/ReadFile.groovy

@@ -53,5 +53,41 @@ class ReadFile {
         return utf8Content
     }
 
+    /**
+     * reads content of binary file and returns byte array
+     * @param filePath
+     * @return
+     */
+    byte[] readBinaryFile(String filePath) {
+        File file = new File(filePath)
+        byte[] binaryContent = file.bytes
+        return binaryContent
+    }
+    
+    /**
+     * More Examples of reading a file 
+     * @return
+     */
+    def moreExamples() {
+        def list = new File("src/main/resources/fileContent.txt").collect {it}
+                
+        def array = new File("src/main/resources/fileContent.txt") as String[]
+                
+        new File("src/main/resources/fileContent.txt").eachLine { line ->
+            println line
+        }
+        
+        def is = new File("src/main/resources/fileContent.txt").newInputStream()
+        is.eachLine {
+            println it
+        }
+        is.close()
+        
+        new File("src/main/resources/fileContent.txt").withInputStream { stream ->
+            stream.eachLine { line ->
+                println line
+            }
+        }
+    }
 
 }

core-groovy/src/main/resources/utf8Content.html

@@ -0,0 +1,5 @@
+ᚠᛇᚻ᛫ᛒᛦᚦ᛫ᚠᚱᚩᚠᚢᚱ᛫ᚠᛁᚱᚪ᛫ᚷᛖᚻᚹᛦᛚᚳᚢᛗ
+ᛋᚳᛖᚪᛚ᛫ᚦᛖᚪᚻ᛫ᛗᚪᚾᚾᚪ᛫ᚷᛖᚻᚹᛦᛚᚳ᛫ᛗᛁᚳᛚᚢᚾ᛫ᚻᛦᛏ᛫ᛞᚫᛚᚪᚾ
+ᚷᛁᚠ᛫ᚻᛖ᛫ᚹᛁᛚᛖ᛫ᚠᚩᚱ᛫ᛞᚱᛁᚻᛏᚾᛖ᛫ᛞᚩᛗᛖᛋ᛫ᚻᛚᛇᛏᚪᚾ
+
+¥ · £ · € · $ · ¢ · ₡ · ₢ · ₣ · ₤ · ₥ · ₦ · ₧ · ₨ · ₩ · ₪ · ₫ · ₭ · ₮ · ₯ · ₹

core-groovy/src/test/groovy/com/baeldung/file/ReadFileUnitTest.groovy

@@ -48,11 +48,21 @@ Line 3 : String content""")
 
     def 'Should return UTF-8 encoded file content in string using ReadFile.readFileStringWithCharset given filePath' () {
         given:
-            def filePath = "src/main/resources/fileContent.txt"
+            def filePath = "src/main/resources/utf8Content.html"
         when:
             def noOfLines = readFile.readFileStringWithCharset(filePath)
         then:
             noOfLines
             noOfLines instanceof String
     }
+    
+    def 'Should return binary file content in byte arry using ReadFile.readBinaryFile given filePath' () {
+        given:
+            def filePath = "src/main/resources/sample.png"
+        when:
+            def noOfLines = readFile.readBinaryFile(filePath)
+        then:
+            noOfLines
+            noOfLines instanceof byte[]
+    }
 }